Mallomonas cf. akrokomos Ruttner

(Fig. 2B)

DISTRIBUTION. — Cosmopolitan (Kristiansen 2000).

REMARKS

We did not observe the scales of M. akrokomos but we found its characteristic stomatocyst (Cronberg 1980). The stomatocyst was oval (9.45-10.85 × 5.75-8.68 µm) with a smooth surface. The collar is cylindrical, may be situated centrically or acentrically on the posterior hemisphere and often has a fluted outer margin (collar diameter 2.97-3.19 µm; height 0.9-1.0 µm). The pore was not observed.